Bottom portion of a golf club head



FIG. 1 is a perspective view of a golf club head held upside down and showing my new design;

FIG. 2 is a front elevational of the golf club head;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a plan view of the golf club head.

The broken line showing of the golf club head is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bottom portion of a golf club head, as shown and described. 